Theories on the Origin of the Solar System PDF

THEORIES ON THE ORIGIN OF THE SOLAR SYSTEM SPACE OBJECTS IN THE SOLAR SYSTEM SUN ONE MOONS 173 PLANETS 8 DWARF PLANETS 5 ASTEROIDS 150 MILLION AND MORE COMETS MILLIONS OF THEM IN THE OORT...

THEORIES ON THE ORIGIN OF THE SOLAR SYSTEM SPACE OBJECTS IN THE SOLAR SYSTEM SUN ONE MOONS 173 PLANETS 8 DWARF PLANETS 5 ASTEROIDS 150 MILLION AND MORE COMETS MILLIONS OF THEM IN THE OORT CLOUD. OORT CLOUD MILLIONS OF PLANETESIMAL, ICY PARTICLES, AND COMETS. THEORIES Nebular theory Condensation theory Planetesimal theory Tidal theory Capture theory  1. NEBULAR THEORY Also known as the nebular hypothesis. Proposed Pierre-Simon Laplace in 1796. The most accepted theory regarding the origin of the solar system.  NEBULAR THEORY The formation of the solar system began with a large spherical cloud of hydrogen and helium gases, and cosmic dust some 4.6 billion years ago. The cloud is called nebula and is composed of 70% hydrogen and 28% helium. The rest are traces of other elements such as lithium, carbon, nitrogen, and oxygen.  2. CONDENSATION THEORY Also known as the dust-cloud theory or protoplanets theory. Proposed by Carl Von Weizsacker in 1943. Almost the same as the nebular hypothesis, the only difference is the absence of supernova.  2. CONDENSATION THEORY It proposes that our solar system began from a nebula: a dense cloud of gas, dust, and icy particles. Dust and icy particles formed lumps of bigger masses which eventually became the planets.  3. PLANETESIMAL THEORY Also know as the collision theory. Proposed by Thomas Chrowder Chamberlin and Forest Ray Moulton. It simply states that a nearby star collided with ours, and the resulting cataclysm ejected massive quantities of debris into space: gas, dust, trace elements of carbon, nitrogen, oxygen, and metals.  4.TIDAL THEORY Proposed by James H. Jeans and Harold Jeffreys. Similar to planetesimal theory only that instead of two stars directly colliding, two stars nearly collided with each other.  5. CAPTURE THEORY It was proposed by Michael Mark Woolfson in 1946. Capture theory is somewhat similar with tidal theory. The difference is it our sun which captured stellar matter from nearby but smaller star. CONDITIONS THAT SUPPORT LIFE ON EARTH  CONDITIONS THAT SUPPORT LIFE ON EARTH Earth occupies a circumstellar habitable zone. Earth has a magnetic field. Earth has an atmosphere rich in nitrogen and oxygen. Earth’s climate and temperature are relatively stable. EARTH’S MAGNETIC FIELD EARTH’S ATMOSPHERE  LATENT DISCOVERIES ABOUT THE SOLAR SYSTEM Living organisms may have been flourishing in mars in the past. Asteroids orbiting our sun could impact earth, leading to an extinction event for our planet.  LATENT DISCOVERIES ABOUT THE SOLAR SYSTEM The sun with its solar storms and spots could significantly disrupt life in our planet and effect climate change. Saturn’s moon Enceladus was discovered to have saltwater ocean below its frozen surface.